Grinding device.



F. M. HENSHAW.

GRINDING DEVICE.

APPLICATION FILED OCT. 6. 1916.

1,240,716. PatentedSept. 18,1917.

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w ATTORNEY UNITED STATES PATENT QFFICE.

FRANCIS M. HENSHAW, OF OKLAHOMA, OKLAHOMA.

GRINDING DEVICE.

To all whom it may concern:

Be it known that I, FRANCIS M. HENSHAW, a citizen of the United States,residing at Oklahoma city, in the county of Oklahoma and State ofOklahoma, have invented a certain new and useful Improvement in GrindingDevices, of which the following is a specification.

My invention relates to improvements in grinding devices.

The object of my invention is to provide a grinding device adapted forsharpening scissors, knives and other articles which may be economicallymanufactured, which is simple, strong and durable and not liable to getout of order and which is eflicient in its operation.

My invention also provides a construe tion which may be secured inoperative position upon the sewing machine withoutthe employment of anyclamps or similar de vices for locking the grinding device to the sewingmachine, but which aft-er being slid into the operative position on thesewing machine may be retained in such position and operated byfrictional contact of a r0- tating element thereof with the fly wheel ofthe sewing machine.

The novel features of my invention are hereinafter fully described andclaimed.

In the accompanying drawing which illustrates the preferred embodimentof my invention,

Figure 1 is a side elevation of my improved grinding device.

Fig. 2 is a plan view of the same.

Fig. 3 is a side elevation showing my improved grinding device inoperative posi tion upon a sewing machine, the upper portion of which isshown, the support of the grinding device being retained in position bymeans of a spring connecting the support with an anchor attached to thetable of the sewing machine.

Fig. 4 is a perspective view of a crank adapted to be attached to theshaft of the grinding device for manually turning the shaft.

Similar reference characters designate similar parts in the differentviews.

1 designates a support preferably in the form of a tripod provided withthree vertical screw-threaded holes in which are fitted respectivelythree screws 2 which are vertically adjustable and form feet forsupporting the device upon the table 3 of a Specification of LettersPatent. Patented Sept 18, 1917 Application filed October 6, 1916.

Serial No. 124,068.

sewing machine of the ordinary household type.

The lower ends of the screws 2 are preferably provided with rubber tips4 which serve the function of a resilient bearing and also for theprevention of niarring the surface of the table, 3. V

Rotatably carried on the support is a grinding membersuch as an emerywheel 5 which may be used for grinding or sharpening articles of variouskinds.

Operatively engaging the wheel 5 is a frictional driving meanspreferably comprising a horizontal shaft 6 located intermediate of thescrews 2 having secured to it a friction pulley 7, preferably having anannular grooved periphery adapted to engage and be rotated by the flywheel 8 of the sewing machine.

Preferably the pulley 7 engages the under side of the fly wheel 8 at apoint intermediate of the right and left hand screws as viewed in Fig.3, whereby the pressure between wheels 7 and 8 required to rotate thepulley 7 and the shaft 6 and grinding wheel 5, will not tend tolaterally tip the grinding device on the table 3. This location of thepoint of contact intermediate of the screws and against the under sideof the fly wheel 8 also tends to retain the grinding device in theoperative position shown in Fig. 3, when the wheel 8 of the machinerotates in a counter-clockwise direction as viewed in Fig. 3.

In operating my invention, the screws 2 are adjusted vertically, so astoadapt the machine to any inequalities in the upper side of the table,and also to bring the pulley 7 into operative relationship with the flywheel 8 regardless of the diameter of the fly wheel or of its heightabove the table.

After such adjustment has been made of the screws 2, it is but necessaryto slide the mechanism horizontally upon the table top into or from theoperative position.

hen the fly wheel 8 rotates counterclockwise, as viewed in Fig. 3, noclamps or other securing devices are needed to hold the grinding deviceoperatively engaged with the wheel 8.

In the event that the fly wheel 8 rotates, as it does in some machines,in a clockwise direction, as viewed in Fig. 3, I provide means whichexerts force in the horizontal direction tending to hold the pulley 7engaged with the fly wheel 8.

Such means may comprise a coil spring 9, one end of which is secured tothe adjacent screw 2 and the other end of which is affixed to ananchoring device comprising a hook 10 adapted to engage one side edge ofthe table 3, the tension of the spring 9 being such that it will pullthe supporting member 1 and yieldingly hold it in the operativeposition.

It will be obvious that my improved grinding device may have the pulley7 driven by the belt or other running parts of the sewing machine, orthe pulley may be rotated by being connected with an electric or othermotor. 7

In order that the shaft 6 may be rotated b T hand as well as b 'aowerone end of the shaft 6 is provided with a squared portion 11 adapted toslidably fit a square socket 12 provided in a detachable crank 13 shownin Fig. 4. o

The disposition of the screws 2 relatively to the shaft 6 is such thatstability will be afiorded to the grinding mechanism when the latter isin operation. t

I do not limit my invention to the structure shown and described, asmodifications, within the scope of the appended claims, may be madewithout departing from the spirit of my invention.

What I claim is 1. In combination, a grinding member, a friction pulley,a shaft carrying said member and said pulley and a support for the shaftadapted to rest on the top of a sewing machine table and to freely slidethereon and to hold the shaft at an elevation such that the point ofcontact of the sewing machine fiy wheel and friction pulley is slightlyabove the lowest point of the fly wheel, whereby when the fly wheel isrotated in a direction snch that any point on its periphery travels fromsaid point of con tact downwardly, the pulley will be maintained byfriction in contact with the fly wheel.

2. In combination, a frictional driving means, a grinding member carriedthereby,

and a support on which said driving means is rotatable, said supportbeing adapted to rest on the top of a sewing machine table and to movefreely thereon and to hold the driving means at an elevation such thatthe point of contact of said driving means and the sewing machine flywheel is slightly above the lowest point of the fly wheel, whereby whenthe fly wheel is rotated in a direction such that any point on itsperiphery travels from said point of contact downwardly, the drivingmeans will be maintained by friction in contact with the fly wheel.

In testimony whereof I have signed my name to this specification.

FRANCIS M. HEUSHAW.

Copies of this patent may be obtained for five cents each, by addressingthe Gom'missioner of Patents, Washington, D. 0.

